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Subscriptions-PayPal.class.php
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Subscriptions-PayPal.class.php
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<?php
/**
* @name ElkArte Forum
* @copyright ElkArte Forum contributors
* @license BSD http://opensource.org/licenses/BSD-3-Clause
*
* This software is a derived product, based on:
*
* Simple Machines Forum (SMF)
* copyright: 2011 Simple Machines (http://www.simplemachines.org)
* license: BSD, See included LICENSE.TXT for terms and conditions.
*
* @version 1.0 Alpha
*
*/
// This won't be dedicated without this - this must exist in each gateway!
// ElkArte Payment Gateway: paypal
if (!defined('ELK'))
die('No access...');
/**
* Class for returning available form data for this gateway
*/
class paypal_display
{
/**
* Name of this payment gateway
*/
public $title = 'PayPal';
/**
* Return the admin settings for this gateway
*
* @return array
*/
public function getGatewaySettings()
{
global $txt;
$setting_data = array(
array(
'text', 'paypal_email',
'subtext' => $txt['paypal_email_desc']
),
);
return $setting_data;
}
/**
* Is this enabled for new payments?
*
* @return boolean
*/
public function gatewayEnabled()
{
global $modSettings;
return !empty($modSettings['paypal_email']);
}
/**
* What do we want?
*
* Called from Profile-Actions.php to return a unique set of fields for the given gateway
* plus all the standard ones for the subscription form
*
* @param type $unique_id
* @param type $sub_data
* @param type $value
* @param type $period
* @param type $return_url
* @return string
*/
public function fetchGatewayFields($unique_id, $sub_data, $value, $period, $return_url)
{
global $modSettings, $txt, $boardurl;
$return_data = array(
'form' => 'https://www.' . (!empty($modSettings['paidsubs_test']) ? 'sandbox.' : '') . 'paypal.com/cgi-bin/webscr',
'id' => 'paypal',
'hidden' => array(),
'title' => $txt['paypal'],
'desc' => $txt['paid_confirm_paypal'],
'submit' => $txt['paid_paypal_order'],
'javascript' => '',
);
// All the standard bits.
$return_data['hidden']['business'] = $modSettings['paypal_email'];
$return_data['hidden']['item_name'] = $sub_data['name'] . ' ' . $txt['subscription'];
$return_data['hidden']['item_number'] = $unique_id;
$return_data['hidden']['currency_code'] = strtoupper($modSettings['paid_currency_code']);
$return_data['hidden']['no_shipping'] = 1;
$return_data['hidden']['no_note'] = 1;
$return_data['hidden']['amount'] = $value;
$return_data['hidden']['cmd'] = !$sub_data['repeatable'] ? '_xclick' : '_xclick-subscriptions';
$return_data['hidden']['return'] = $return_url;
$return_data['hidden']['a3'] = $value;
$return_data['hidden']['src'] = 1;
$return_data['hidden']['notify_url'] = $boardurl . '/subscriptions.php';
// Now stuff dependant on what we're doing.
if ($sub_data['flexible'])
{
$return_data['hidden']['p3'] = 1;
$return_data['hidden']['t3'] = strtoupper(substr($period, 0, 1));
}
else
{
preg_match('~(\d*)(\w)~', $sub_data['real_length'], $match);
$unit = $match[1];
$period = $match[2];
$return_data['hidden']['p3'] = $unit;
$return_data['hidden']['t3'] = $period;
}
// If it's repeatable do some javascript to respect this idea.
if (!empty($sub_data['repeatable']))
$return_data['javascript'] = '
document.write(\'<label for="do_paypal_recur"><input type="checkbox" name="do_paypal_recur" id="do_paypal_recur" checked="checked" onclick="switchPaypalRecur();" class="input_check" />' . $txt['paid_make_recurring'] . '</label><br />\');
function switchPaypalRecur()
{
document.getElementById("paypal_cmd").value = document.getElementById("do_paypal_recur").checked ? "_xclick-subscriptions" : "_xclick";
}';
return $return_data;
}
}
/**
* Class of functions to validate a IPN response and provide details of the payment
*/
class paypal_payment
{
/**
* Holds the IPN response data
*/
private $return_data;
/**
* This function returns true/false for whether this gateway thinks the data is intended for it.
*
* @return boolean
*/
public function isValid()
{
global $modSettings;
// Has the user set up an email address?
if (empty($modSettings['paypal_email']))
return false;
// Check the correct transaction types are even here.
if ((!isset($_POST['txn_type']) && !isset($_POST['payment_status'])) || (!isset($_POST['business']) && !isset($_POST['receiver_email'])))
return false;
// Correct email address?
if (!isset($_POST['business']))
$_POST['business'] = $_POST['receiver_email'];
if ($modSettings['paypal_email'] !== $_POST['business'] && (empty($modSettings['paypal_additional_emails']) || !in_array($_POST['business'], explode(',', $modSettings['paypal_additional_emails']))))
return false;
return true;
}
/**
* Post the IPN data received back to paypal for validaion
* Sends the complete unaltered message back to PayPal. The message must contain the same fields
* in the same order and be encoded in the same way as the original message
* PayPal will respond back with a single word, which is either VERIFIED if the message originated with PayPal or INVALID
*
* If valid returns the subscription and member IDs we are going to process if it passes
*
* @return string
*/
public function precheck()
{
global $modSettings, $txt;
// Put this to some default value.
if (!isset($_POST['txn_type']))
$_POST['txn_type'] = '';
// Build the request string - starting with the minimum requirement.
$requestString = 'cmd=_notify-validate';
// Now my dear, add all the posted bits in the order we got them
foreach ($_POST as $k => $v)
$requestString .= '&' . $k . '=' . urlencode($v);
// Can we use curl?
if (function_exists('curl_init') && $curl = curl_init((!empty($modSettings['paidsubs_test']) ? 'https://www.sandbox.' : 'http://www.') . 'paypal.com/cgi-bin/webscr'))
{
// Set the post data.
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDSIZE, 0);
curl_setopt($curl, CURLOPT_POSTFIELDS, $requestString);
// Set up the headers so paypal will accept the post
curl_setopt($curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($curl, CURLOPT_FORBID_REUSE, 1);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
'Host: www.' . (!empty($modSettings['paidsubs_test']) ? 'sandbox.' : '') . 'paypal.com',
'Connection: close'
));
// Fetch the data returned as a string.
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
// Fetch the data.
$this->return_data = curl_exec($curl);
// Close the session.
curl_close($curl);
}
// Otherwise good old HTTP.
else
{
// Setup the headers.
$header = 'POST /cgi-bin/webscr HTTP/1.1' . "\r\n";
$header .= 'Content-Type: application/x-www-form-urlencoded' . "\r\n";
$header .= 'Host: www.' . (!empty($modSettings['paidsubs_test']) ? 'sandbox.' : '') . 'paypal.com' . "\r\n";
$header .= 'Content-Length: ' . strlen ($requestString) . "\r\n";
$header .= 'Connection: close' . "\r\n\r\n";
// Open the connection.
if (!empty($modSettings['paidsubs_test']))
$fp = fsockopen('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);
else
$fp = fsockopen('www.paypal.com', 80, $errno, $errstr, 30);
// Did it work?
if (!$fp)
generateSubscriptionError($txt['paypal_could_not_connect']);
// Put the data to the port.
fputs($fp, $header . $requestString);
// Get the data back...
while (!feof($fp))
{
$this->return_data = fgets($fp, 1024);
if (strcmp(trim($this->return_data), 'VERIFIED') === 0)
break;
}
// Clean up.
fclose($fp);
}
// If this isn't verified then give up...
if (strcmp(trim($this->return_data), 'VERIFIED') !== 0)
exit;
// Check that this is intended for us.
if ($modSettings['paypal_email'] !== $_POST['business'] && (empty($modSettings['paypal_additional_emails']) || !in_array($_POST['business'], explode(',', $modSettings['paypal_additional_emails']))))
exit;
// Is this a subscription - and if so is it a secondary payment that we need to process?
if ($this->isSubscription() && (empty($_POST['item_number']) || strpos($_POST['item_number'], '+') === false))
// Calculate the subscription it relates to!
$this->_findSubscription();
// Verify the currency!
if (strtolower($_POST['mc_currency']) !== $modSettings['paid_currency_code'])
exit;
// Can't exist if it doesn't contain anything.
if (empty($_POST['item_number']))
exit;
// Return the id_sub and id_member
return explode('+', $_POST['item_number']);
}
/**
* Is this a refund?
*
* @return boolean
*/
public function isRefund()
{
if ($_POST['payment_status'] === 'Refunded' || $_POST['payment_status'] === 'Reversed' || $_POST['txn_type'] === 'Refunded' || ($_POST['txn_type'] === 'reversal' && $_POST['payment_status'] === 'Completed'))
return true;
else
return false;
}
/**
* Is this a subscription?
*
* @return boolean
*/
public function isSubscription()
{
if (substr($_POST['txn_type'], 0, 14) === 'subscr_payment' && $_POST['payment_status'] === 'Completed')
return true;
else
return false;
}
/**
* Is this a normal payment?
*
* @return boolean
*/
public function isPayment()
{
if ($_POST['payment_status'] === 'Completed' && $_POST['txn_type'] === 'web_accept')
return true;
else
return false;
}
/**
* How much was paid?
*
* @return float
*/
public function getCost()
{
return (isset($_POST['tax']) ? $_POST['tax'] : 0) + $_POST['mc_gross'];
}
/**
* Record the transaction reference and exit
*
*/
public function close()
{
global $subscription_id;
$db = database();
// If it's a subscription record the reference.
if ($_POST['txn_type'] == 'subscr_payment' && !empty($_POST['subscr_id']))
{
$_POST['subscr_id'] = $_POST['subscr_id'];
$db->query('', '
UPDATE {db_prefix}log_subscribed
SET vendor_ref = {string:vendor_ref}
WHERE id_sublog = {int:current_subscription}',
array(
'current_subscription' => $subscription_id,
'vendor_ref' => $_POST['subscr_id'],
)
);
}
exit();
}
/**
* A private function to find out the subscription details.
*
* @return boolean
*/
private function _findSubscription()
{
$db = database();
// Assume we have this?
if (empty($_POST['subscr_id']))
return false;
// Do we have this in the database?
$request = $db->query('', '
SELECT id_member, id_subscribe
FROM {db_prefix}log_subscribed
WHERE vendor_ref = {string:vendor_ref}
LIMIT 1',
array(
'vendor_ref' => $_POST['subscr_id'],
)
);
// No joy?
if ($db->num_rows($request) == 0)
{
// Can we identify them by email?
if (!empty($_POST['payer_email']))
{
$db->free_result($request);
$request = $db->query('', '
SELECT ls.id_member, ls.id_subscribe
FROM {db_prefix}log_subscribed AS ls
INNER JOIN {db_prefix}members AS mem ON (mem.id_member = ls.id_member)
WHERE mem.email_address = {string:payer_email}
LIMIT 1',
array(
'payer_email' => $_POST['payer_email'],
)
);
if ($db->num_rows($request) === 0)
return false;
}
else
return false;
}
list ($member_id, $subscription_id) = $db->fetch_row($request);
$_POST['item_number'] = $member_id . '+' . $subscription_id;
$db->free_result($request);
}
}